Fix bug in 530 that was writing uint8 data out with BSCALE and BZERO, subsequently resulting in them being read in as floating point.
Fix bug in 530 that was writing uint8 data out with BSCALE and BZERO, subsequently resulting in them being read in as floating point.


git-svn-id: 5305e2c1a78737cf7dd5f8f44e9bbbd00348fde7@533 ed100bfc-0583-0410-97f2-c26b58777a21

spacetelescope/PyFITS,embray/PyFITS,embray/PyFITS,embray/PyFITS,spacetelescope/PyFITS,embray/PyFITS